Which Malpractice Insurance, NSO or CM&F group?

[grammy57]

My friend need to get some insurance and I was wondering which insurer you preferred, NSO or C M & F group? Or, is there some other company you feel is better? I think I'm leaning towards NSO right now. Any help/advise is greatly appreciated. Not sure if the state makes a difference, but it's for Michigan RN.